Lecture+9 - Monoprotic Acid-Base Equilibria Fluorescein...

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Monoprotic Acid-Base Equilibria Fluorescein emission depends on pH Tetramethyl rhodamine fluorescence does not depend on pH
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Strong Acids and Bases What could be easier than calculating the pH of 0.10 M HBr? HBr is a strong acid, so the reaction goes to completion .
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Raman spectrum Strong acids in dilute solution are essentially completely dissociated . As concentration increases, the degree of dissociation decreases. The figure shows a Raman spectrum of solutions of nitric acid of increasing concentration . The spectrum measures scattering of light whose energy corresponds to vibrational energies of molecules. The sharp signal at 1049 cm 1 in the spectrum of 5.1 M NaNO 3 is characteristic of free anion.
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The graph shows the fraction of dissociation deduced from spectroscopic measurements. It is instructive to realize that, in 20 M HNO 3 , there are fewer H 2 O molecules than there are molecules of HNO 3 . Dissociation decreases because there is not enough solvent to stabilize the free ions.
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What is the pH of 1.0 × 10 8 M KOH? Using only K w ; you will find that the pH=6.0 – wrong answer!! Taking into account the charge
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This note was uploaded on 02/14/2011 for the course SCIENCE 321 taught by Professor Aaa during the Spring '11 term at Windsor.

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Lecture+9 - Monoprotic Acid-Base Equilibria Fluorescein...

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